Method and system for identifying ambient background level using feature mask processing

A method comprising:

• measuring, by at least one gas sensor, a gas concentration;
• determining, by a feature mask processing module of a processor, if a concentration value from a concentration signal corresponding to the gas concentration is a feature;
• determining, by the feature mask processing module, if a normalized power from the concentration signal is a feature;
• determining, by the feature mask processing module, if a normalized wavelet probability density function (PDF) from the concentration signal is a feature;
• determining, by the feature mask processing module, if a centroid of a normalized wavelet cumulative distribution function (CDF) from the concentration signal is a feature;
• determining, by the feature mask processing module, if a concentration rate-of-change from the concentration signal is a feature;
• determining, by the feature mask processing module, if a vertical velocity from the concentration signal is a feature;
• and
• determining, by the feature mask processing module, if a persistence from the concentration signal is a feature.

A system comprising:

• at least one gas sensor configured to measure gas concentrations at a plurality of locations and transmit a plurality of concentration signals corresponding to the measured gas concentrations to a processor;
• and
• the processor configured to communicate with the at least one gas sensor and including:
• a feature identification module configured to evaluate each individual concentration signal of the concentration signals with a plurality of criteria by identifying if the individual concentration signal is a peak signal based on whether a plurality of values extracted from the individual concentration signal according to the plurality of criteria are within thresholds and tagging the individual concentration signal as a feature if the individual concentration signal is the peak signal;
• and
• an ambient background level calculator module configured to calculate an ambient background gas level by removing the measured gas concentration corresponding to the concentration signal set as a feature from an original background level.